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코어 없는 PCB 변압기와 인덕터를 이용한 ZVS Forward DC-DC 컨버터
황선민,안태영,Hwang, Sun-Min,Ahn, Tae-Young 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.4
본 논문은 코어 없는 PCB(Print circuit board) 변압기와 인덕터를 이용한 ZVS (Zero voltage switching) Forward DC-DC 컨버터의 실험 결과 및 실용 가능성을 보고한 것이다. 최대출력 12W, 최대 스위칭주파수 2.2MHz, 정격 입력전압 24V를 갖는 실험용 컨버터가 검증되었다. 코어 손실이 없기 때문에 코어 없는 PCB 변압기와 인덕터가 고주파 동작에 적합하다는 것을 밝혔다 실험 컨버터는. 최저 70% 에서 80%의 전력변환 효율을 나타내었고, 12V 출력전압은 0.7% 이내에서 안정되었다. The experimental results and application potentials of a ZVS Forward DC-DC converter based coreless PCB transformer and coreless inductor are presented. The experimental converter, that has a maximum power of 12W, maximum switching frequency of 2.2MHz and nominal input voltage of 24V, has been successfully implemented. The coreless PCB transformer and inductor are found to have many favorable characteristics to high frequency operations due to the absence of a core loss. A power conversion efficiency of the experimental converter was measured at 70${\sim}$80%, and the output was regulated at 12V within 0.7% tolerance.
황선민(Hwang Sun Min),김지언(Kim chiyen),이민철(Lee Min Cheol) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.1
The surgical robot instrument looks like a long cylinder with small diameter which is suitable to small invasive surgery able to decrease the amount of healthy tissue damaging. The shape of the surgical robot instrument restricts the power transmission and so only the cable-driven mechanism is adoptable to the robot However cable has elastic characteristic and pulleys have inertia and friction, cable-driven mechanism becomes higher nonlinear system‘ This paper applies a robust motion control algorithm to overcome the nonlinearity problem. To overcome the nonlinearity of the robot, this paper uses a sliding mode control with sliding perturbation observer (SMCSPO), as robust control algorithm. This controller uses not only state observer but also perturbation observer which involves the system nonlinearities in the surgical robot instrument. Therefore this paper proposes to use the controller which adopts two observers specialized to nonlinear system as the surgical robot instrument. In this paper, the control ecnamrofrep of the proposed algorithm is evaluated by the simulation applied to a three-degree-of-freedom (DOF) surgical robot instrument. The results show high accuracy and good performance.
황선민 ( Sun-min Hwang ),김규진 ( Kyu-jin Kim ),허의남 ( Eui-nam Huh ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
현재 전세계는 빠른 속도로 고령화가 진행되고 있다. 전세계 65 세 이상의 인구는 3 억 5 천 7 백만에서 7 억 6 천 1 백만 명으로 2025 년까지 증가할 것으로 추산되고 있다. 본 논문에서는 이러한 급속한 고령화 사회에 대비하여 노인에 대한 의료비용을 절감하고 더 나은 치료를 제공하고 삶의 질을 높이기 위한 해결책을 제시하려고 한다. 따라서, 우리는 카메라 센서를 이용한 효율적이고 자동화된 상황 감지시스템을 구축하여 헬스케어 환경을 제공하고자 한다.
PCB 변압기 및 인덕터를 이용한 ZVS Forward DC-DC 컨버터
황선민(Sun Min Hwang),안태영(Tae Young Ahn),최병조(Byung Cho Choi),김희준(Hee Jun Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In his paper, the principle of using careless printed circuit board (PCB) based transformer in 2.3MHz, l2W class ZVS Forward DC-DC converter has been successfully demonstrated With no core loss, coreless PCB transformer and inductor are found to have favorable characteristics at high frequency operations<br/> The maximum power conversion efficiency is 80%. Even for high operating frequency, an efficiency greater than 70% can be obtained with under 0 7% regulation error.
랜덤하프변환과 코너추출을 이용한 경사면의 장애물 위치 탐색
황선민(Sun Min Hwang),이민철(Min Cheol Lee) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.5
This paper suggests a judgement method for an inclined plane before entrance of it and the detection of obstacle position. Main idea is started from the assumption that obstacle is always on the bottom plane, and comer appears at this position. The process to detect the obstacle consists of three steps. First the 3D data using stereo matching is acquired to detect an obstacle. Second a bottom plane is extracted by using limit condition. Last the obstacle position is found by using Harris corner detection. obstacle position detection on an inclined plane was verified by outdoor and indoor experiment. In error analysis, it is confirmed that an average error of obstacle detection in outdoor was larger than the error in indoor but the error are within about 0.030m. This method will be applied to unmanned vehicles to navigate under various environment.